Digby lays out the current state of American foreign policy.

The lesson of Iraq is that the United States is going to do what it wants to do without regard to international law or any nation’s good faith effort to cooperate. If they have decided to take military action against you it is a fait accompli. “Aggressive engagement” looks suspiciously like the “Decade of Defiance and Deception” public relations package that sold the war to the American public. No world leader is now under the misapprehension that complying with American demands necessarily guarantees that he will not be invaded and deposed anyway. There is no value in face saving or compromise because the US has proved that it will change its goals and create new rationales at will. So, the only question for any leader in this situation is whether to surrender without bloodshed or go down fighting. All moral authority is vested in America's willingness to deploy its military.

The lesson of Iraq for the US is that the United States had better be prepared to invade any country it “aggressively engages” from now on because it proved to leaders everywhere that capitulating to its “demands” guarantees them nothing. US power now rests entirely on force – it can no longer use diplomacy or any kind of positive reward for good behavior because the lesson of Iraq is that the US cannot be trusted to negotiate in good faith. Any threats short of war are useless because foreign leaders can no longer count on the US to keep its word not to invade if certain conditions have been met.